Red light therapy comes down to two measurable variables: wavelength and how deep it reaches. Here is what that actually means, without the marketing gloss.
The Science
Product education
How the two wavelengths compare
A simple depth visual for the specs area — 850nm reaches further than 660nm, shown at a glance instead of buried in a spec line. Kept qualitative, not a specific clinical depth figure, so it stays factual without reading as a treatment claim.
660nm
Visible red
850nm
Near-infrared
Surface
Deeper tissue
The science, briefly
Two wavelengths, two different jobs
Both come standard here — most panels make you pick one, or buy a second device for the other.
660NM
Visible red
Sits at the edge of what your eyes can see and works close to the surface. This is the wavelength in most basic red light devices.
850NM
Near-infrared
Invisible to the eye and reaches further than red light alone. Usually sold separately, in a second, more expensive device.
